ECG23 is D Addario s lightest gauge of flatwound strings. Chromes smooth feel and warm mellow tone is ideal for traditional jazz rockabilly twang R&B and some pop/rock styles. D Addario Chromes are wound with flattened stainless steel ribbon wire which is polished to an incredibly smooth surface. Chromes deliver a distinctive damped but tone-rich sound that only flatwounds can produce. D Addario Chromes are the world s most popular flatwound strings.